Every unprejudiced observer seers that the greater the centralization of the means of production, the greater is the corresponding heaping together of the laborers within a given space; that therefore, the swifter capitalistic accumulation, the more miserable are the dwellings of the working people.

Accumulation of wealth at one pole is... at the same time accumulation of misery, agony of toil, slavery, ignorance, brutality, mental degradation, at the opposite pole, i.e., on the side of the class that produces its own product in the form of capital.